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Saitama, Japan

Katsuura S.,Tokushima University | Kamezaki Y.,Tokushima University | Kamezaki Y.,Katakura Industries Co. | Yamagishi N.,Tokushima University | And 7 more authors.
International Journal of Psychophysiology | Year: 2011

Objective: Anxiety and depressive mood are sometimes accompanied by modulation of neuroendocrine and immune functions. The aim of this study was to identify circulating immune mediators reflecting anxiety and depressive mood in healthy young adults. Methods: Anxiety and depressive mood in 209 healthy medical students (125 males and 84 females, aged 20.7 ± 2.7. years (mean ± SD)) were assessed by the Spielberger state-trait anxiety inventory (STAI) and the Zung self-rating depression scale (Zung-SDS), respectively. Cortisol and chromogranin A (CgA) levels in saliva were measured using enzyme immunoassay kits, and 50 different mediators in sera were measured by a multiplex-suspension array system. The level of statistical significance was set at Α=0.05. Results: Forty-four mediators were measurable in sera, and each mediator showed substantial individual variations. After determining Pearson correlation coefficients, we selected candidate cytokines whose levels were associated with STAI-state (2 cytokines), STAI-trait (8 cytokines), or SDS scores (8 cytokines). The candidate cytokines plus interleukin (IL)-1Β, IL-6, tumor necrosis factor-α, and macrophage migration inhibitory factor were then subjected to multiple regression analysis adjusted for gender, BMI, and salivary concentrations of cortisol and CgA. Vascular endothelial growth factor (VEGF) was independently and negatively associated with both trait anxiety (p<0.05) and depressive mood (p<0.01). IL-1Β showed independently positive association with depressive mood (p<0.05). Interactions between these two cytokines and gender or BMI were not observed. Conclusion: Besides IL-1Β, circulating VEGF may be a potential biomarker for negative mood states in healthy young adults. © 2011 Elsevier B.V. Source


Katsuura S.,Tokushima University | Katsuura S.,Japan Science and Technology Agency | Kamezaki Y.,Tokushima University | Kamezaki Y.,Katakura Industries Co. | And 9 more authors.
International Journal of Psychophysiology | Year: 2010

This study was designed to prospectively examine the impact of a brief naturalistic stressor (academic examination) on salivary/serum cortisol, measures of anxiety and depressive mood, and 50 circulating immune mediators assessed 7. days before, the first day of, and 2. days after the first term examination period (5. days) among 20 male and 6 female medical students (19.7 ± 3.1 years, mean ± SD). Of 42 serum factors detected, repeated measures ANOVA and Bonferroni post hoc testing indicated that concentrations of macrophage migration inhibitory factor (MIF), monocyte chemoattractant protein (MCP)-3, and β-nerve growth factor (β-NGF) were significantly decreased 2. days after finishing examinations, compared with the levels on the first day of examinations (p<0.05) in association with a concomitant post-examination decreases (p<0.05) in anxiety and salivary cortisol levels. In contrast, interleukin (IL)-16 was reciprocally increased between the two time points (p<0.05). However, after correction for multiple comparisons, only changes in MIF were significant (p<0.05/42. =0.00119), and MIF levels peaked on the first day of examinations was significantly higher than those measured both 7. days before and 2. days after the examination. The present high-throughput analysis with multiplex cytokine panels reconfirms the impact of brief naturalistic stressors on immune outcomes, and suggests a potential role of MIF in the acute stress response. © 2010 Elsevier B.V. Source


Ishiyama S.,Katakura Industries Co. | Ikeda M.,Katakura Industries Co.
Biotechnology Letters | Year: 2010

Some recombinant proteins expressed by baculovirus expression vector systems (BEVS) aggregate because the BEVS can produce large amounts of protein late during infection, when post-translational modification and protein quality control mechanisms are inactive. For expression during earlier stages than that driven by the polyhedrin (polh) very late promoter, transfer vectors were generated in which this promoter was replaced with a green fluorescent protein (GFP) gene controlled by a vp39 late promoter modified to contain HR3, one of the homologous DNA regions (HRs) of Bombyx mori nuclear polyhedrosis virus (BmNPV). The rise times of the fluorescence of GFP expressed by using recombinant viruses carrying the modified vp39 promoter were earlier than those associated with either the polh promoter or the native vp39 promoter lacking HR3. In transient expression assays, the vp39 late promoter in transfer vectors behaved like a delayed-early promoter, and was enhanced by HR3, and required IE-1 protein and various viral gene products encoded on both sides of BmNPV polh. When the vp39 promoter with HR3 was used, the aggregation of several foreign proteins expressed by the BEVS was markedly decreased. This study provides a new option for the expression of sufficiently quality-controlled proteins by using the vp39 promoter and HR3 in BEVS early in baculovirus infection, when the infection has caused little damage in the host cells. © 2010 Springer Science+Business Media B.V. Source


Kamezaki Y.,Tokushima University | Kamezaki Y.,Katakura Industries Co. | Katsuura S.,Tokushima University | Kuwano Y.,Tokushima University | And 2 more authors.
Psychophysiology | Year: 2012

Stress-induced production of proinflammatory cytokines in the brain and periphery is associated with mental distress. In this study, we measured changes in levels of salivary cortisol and 50 circulating immune mediators in 28 4th-grade medical students (19 males and 9 females) 7 weeks before, 1 day before, immediately after, and 1 week after an authorized nationwide examination for promotion. Repeated measures ANOVA with multiple testing correction and post hoc tests revealed that the examination significantly increased levels of proinflammatory cytokines (granulocyte colony-stimulating factor, interferon-γ, interleukin (IL)-1β, and tumor necrosis factor-α), Th2 cytokines (IL-4, IL-5, and IL-13), and β-nerve growth factor in association with significant decreases in salivary cortisol levels and anxiety after the examination. These mediators may have a negative impact on the mental state of healthy young adults exposed to naturalistic stressors. © 2012 Society for Psychophysiological Research. Source


Kobayashi M.,International Christian University | Hayakawa Y.,International Christian University | Park W.,Gangneung - Wonju National University | Banba A.,Tokyo University of Marine Science and Technology | And 6 more authors.
General and Comparative Endocrinology | Year: 2010

Recombinant follicle-stimulating hormone (reFSH) and luteinizing hormone (reLH) of the Japanese eel Anguilla japonica were produced by baculovirus in silkworm Bombyx mori larvae. cDNAs encoding Japanese eel gonadotropin subunits (i.e., FSHβ, LHβ, and common α) were introduced into the baculovirus, which was infected into silkworm larvae after propagation of the recombinant virus in B. mori culture cells. A 100. ml solution of pooled hemolymph from silkworm larvae containing reFSH or reLH were obtained from approximately 250 infected larvae. Ten milliliters of hemolymph were applied to Ni-affinity choromatography, and 5.6 and 3.5. mg of partially purified reFSH and reLH were obtained, respectively. Using Western blot analysis concentrations of reFSH and reLH in the original hemolymph was estimated to be 2.2 and 1.1. mg/ml, respectively. Biological activities of reFSH and reLH were assessed in vitro and in vivo. Purified reFSH and reLH induced eel oocyte maturation in vitro, and administration of hemolymph containing reFSH or reLH induced spermatogenesis in vivo in sexually immature Japanese eel. The present study indicates that a baculovirus-silkworm system could produce large amounts of biologically active recombinant fish gonadotropins for use in investigations in reproductive endocrinology and/or aquaculture of fish. © 2010 Elsevier Inc. Source

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